untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms

• crude
• native
• natural
• raw
• rude
• undressed
• unprocessed
• unrefined

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

At almost every turn, they were guarded, held at gunpoint and kept in such deplorable conditions that one of them developed countless sores, another could not walk and a third had serious health conditions that went untreated. —Shirsho Dasgupta, Miami Herald, 16 May 2025

The curse that plagues Rose is a chilling metaphor for unresolved psychological pain and how fear can metastasize when left untreated. —Jane Lacroix, People.com, 15 May 2025

If left untreated, heatstroke can lead to organ failure, permanent neurological damage, and disability or death. —Ivy Scott, Kansas City Star, 14 May 2025

Scientists at a California biotech company first identified the disease, which, if left untreated, can lead to liver failure and death. —Scott Suckow, San Diego Union-Tribune, 13 May 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease